<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app"></div>
    <script src="../src/react.js"></script>
    <script src="../src/react-dom.js"></script>
    <script src="../src/babel.js"></script>
    <script type="text/babel">

        function Oner(){
            let arr = []
            // setTimeout(function(){
            //     arr = [123,132,111]
            // },2000)
            return (
                <ul>kkk
                    {arr.map((v,i)=>{<li key={i}>{v}</li>})}    
                </ul>
            )
        }



        class Onec extends React.Component{
            constructor(){
                super()
                this.state = {
                    arr:[],
                    timer:''
                }
            }
            componentDidMount(){
                console.log('lllll');
                setInterval(()=>{
                    this.setState({
                        arr:[111,222,333]
                    })
                },2000)
                setInterval(()=>{
                    this.setState({
                        timer:new Date().toLocaleTimeString()
                    })
                },1000)
            }

            render(){
                return (<div>
                    111,{this.props.o}
                    <p>{this.state.arr.map((e,i)=><span key={i}>{e}====</span>)}</p>
                    <p>{this.state.timer}</p>
                    </div>)
            }
        }
        let element = (
            <div>
                <Onec o="occ"></Onec> 
                <Oner></Oner>   
            </div>
        )

        ReactDOM.render(
            element,
            document.getElementById("app")
        )

    </script>
</body>

</html>